The right side of the slide is stamped "Model of 1911 U.S. Navy". Below that on the frame is stamped "No. 2811".
The left side of the slide is stamped "Patented Apr 20 1897, Sept 1902, Dec 19 1905, Feb 14 1911. To the right of this is "Colts PT F.A MFG CO. Hartford Ct. USA"
Under that on the frame it is stamped "Property of United States"
Any advice on the care of its old holster? Would a little bit of neatsfoot oil do anything negative for it?